ASP.NET, SQL Server, WPF, C#, VB.NET

Is it possible in CS 2002 or CS 2007 to develop a custom pipeline that makes 
 
calls to native Commerce Service objects, like loading a profile object 
 
based on the user id retrieved from the OrderForm IDictionary? 
 
Alternatively, is there a way to add custom items to the OrderForm 
 
IDictionary that is passed to my custom pipeline? 
 
Thanks in advance.